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Dozens killed in Mexico office blast

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25 people were killed and more than 100 are injured, interior minister says

The explosion collapsed two floors of an office building, paramedics say

Rescuers have pulled a survivor from the rubble, Mexico's president says

Crews are searching for people trapped in the building

An explosion rocked the offices of Mexico's state oil company Thursday, killing at least 25 people and injuring 101, Mexico's interior minister said.

Dozens of people were trapped in the building after the explosion, Foro TV reported. It was unclear how many of them had been pulled to safety, or whether anyone remained stuck inside late Thursday, Interior Minister Miguel Angel Osorio Chong told reporters.

More than five hours after the blast, rescuers had pulled at least one survivor from the rubble, Mexico's president said in a Twitter post.

Crews were still searching Thursday night for people who could be trapped in the Pemex office complex, which includes one of the city's tallest skyscrapers.

The explosion occurred in a basement and collapsed two floors of a building adjacent to the well-known tower, said Carlos Javier Rodriguez Jurado, one of the first paramedics to arrive at the scene.

Photos:Explosion hits Mexican state oil Pemex

Photos:Explosion hits Mexican state oil Pemex

Explosion hits Mexican state oil company Pemex – Police officers and rescue workers respond to the headquarters of state-owned Mexican oil giant Pemex in Mexico City where a blast killed at least 30 and injured more than 100 on Thursday, January 31.

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Photos:Explosion hits Mexican state oil Pemex

Explosion hits Mexican state oil Pemex – Black smoke billows from the 54-story skyscraper as rescue workers rush to free people trapped in the rubble.

Explosion hits Mexican state oil Pemex – Onlookers look up at the headquarters of the Pemex building in Mexico City.

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Photos:Explosion hits Mexican state oil Pemex

Explosion hits Mexican state oil Pemex – An injured man is helped by others at the site of the blast.

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Photos:Explosion hits Mexican state oil Pemex

Explosion hits Mexican state oil Pemex – A woman receives medical attention on a stretcher after the explosion.

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Photos:Explosion hits Mexican state oil Pemex

Explosion hits Mexican state oil Pemex – A man at the scene of the blast is helped using a rolling chair near the scene of the explosion.

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The explosion tore through the building "from the inside out," he said, and rescuers found many people trapped. Six hours after the explosion, Rodriguez said people were likely still stuck in the rubble.

It was unclear what caused the blast, and Mexico's attorney general's office is investigating, Pemex said in a statement.

A large plume of smoke rose near the building after the explosion around 4 p.m. Thursday, and emergency crews swarmed the scene.

"People were screaming. ... You could see pieces of the wall falling to the ground," said Joaquin Borrell Valenzuela, an attorney for the Pemex comptroller's office, who was in a courtyard outside the building at the time of the blast.

Paramedics quickly arrived and started pulling bodies from the rubble.